Aeronautical Terms beginning with N
N
North
N/A
Not Applicable
N1
Rotational speed of the low pressure compressor in a turbine engine.
N1,N2,N3
Spool speed expressed in percent rpm. N1 on a turboprop is the gas producer speed. N1 on a turbofan or turbojet engine is the fan speed or low pressure spool speed. N2 is the high pressure spool speed on engine with 2 spools and medium pressure spool on engines with 3 spools with N3 being the high pressure spool.
N2
Rotational speed of the high pressure compressor in a turbine engine.
NA
Not Authorized
NAAS
Naval Auxiliary Air Station
NACG
National Aeronautical Charting Group. (obsolete)
NACO
National Aeronautical Charting Office
NAM
North American Model
NANU
Notice Advisory to Navstar Users
NAS
National Airspace System.
NASA
National Aeronautics and Space Administration
NASSI
National Airspace System Status Information
NAT/MNPS
North Atlantic Minimum Navigation Performance Specifications
NATCA
National Air Traffic Controllers Association
Nav
Spec Navigation Specification
NAV/COM
Navigation and Communication Radio.
NAVAID
Navigational Aid.
NCAR
National Center for Atmospheric Research
NCDC
National Climatic Data Center
NCEP
National Centers for Environmental Prediction
NCO
NCEP Central Operations
NCWF
National Convective Weather Forecast
NDB
Nondirectional Radio Beacon.
NDB (ADF)
Nondirectional Beacon (Automatic Direction Finder).
NDFD
National Digital Forecast Database
NE
Northeast
NESDIS
National Environmental Satellite, Data, and Information Service
NEXRAD
Next Generation Weather Radar
NextGen
Next Generation Air Transportation System
NFDC
National Flight Data Center
NFPO
National Flight Procedures Office
NGA
National Geospatial Intelligence Agency
NHC
National Hurricane Center
NIMA
National Imagery and Mapping Agency
NM
Nautical Mile.
NMAC
Near Mid-Air Collision
NNE
North-Northeast
NNEW
Next Generation Network-Enabled
NNW
North-Northwest
NO A/G
No Air-to-Ground Communication
NOAA
National Oceanic and Atmospheric Administration.
Non-RNAV DP
A DP whose ground track is based on ground-based NAVAIDS and/or dead reckoning navigation.
NOPAC
North Pacific
NoPT
No Procedure Turn.
NORDO
(No Radio) Aircraft That Cannot Or Do Not Communicate By Radio When Radio Communication Is Required Are Referred To As “Nordo.
NOS
National Ocean Service
NOSPECI
No SPECI reports are taken at the station
NOTAM
Notice To Airmen
NOTAM [ICAO]
A Notice Containing Information Concerning The Establishment, Condition Or Change In Any Aeronautical Facility, Service, Procedure Or Hazard, The Timely Knowledge Of Which Is Essential To Personnel Concerned With Flight Operations. A. I Distribution-Distribution By Means Of Telecommunication. B. II Distribution-Distribution By Means Other Than Telecommunications
NPA
Nonprecision Approach
NPRM
Notice of Proposed Rulemaking
NRP
National Route Program.
NRR
Non-Restrictive Routing
NSA
National Security Area.
NSE
Navigation System Error
NSW
No Significant Weather
NTAP
Notice To Airmen Publication
NTSB
National Transportation Safety Board.
NTZ
No Transgression Zone
NVS
NAS voice switch
NW
Northwest
NWP
Numerical Weather Prediction
NWS
National Weather Service.
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